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  1. Vortec 5300 5.3L V8
    I've tested the wires leading to the Coil at long last after swapping coils and wires and plugs to eliminate possibilities. But it checks out, I have both grounds and power and the hertz meet specs. is the computer just not sending the signal to the coil? the injector is new if that is connected...
  2. Vortec 5300 5.3L V8
    Hey everyone I have and 01 Chevy 1500 with the 5.3 throwing a p0306. Misfire Cylinder 6. popped on a new injector I had sitting from a plenum swap but what I found is I have no spark at the coil. Swapped in a new coil, still nothing. I'm opting to replace the coil harness but if that fails what...
  3. EcoTec 6.2L V8
    My 2015 GMC sierra has a misfire on cylinder 8. We narrowed it down to a worn cam lobe. We mesured each rocker and found a .13 difference on cylinder 8 than other rockers. How hard is it to replace a camshaft? I know all lifters would need replaced as well. I'm considering the delete. The...
  4. Vortec 5300 5.3L V8
    I have a extended cab 4x4 2000 Silverado 1500 LS 5.3 4l60e. I recently bought it from a buddy and it had been sitting a long time due to fuel pump being out. I dropped tank and realized tank was full of trash so replaced the tank and pump both brand new and went ahead and did filter too. Now...
  5. Engine
    I own a 2015 GMC Sierra. I posted another forum but I didn’t get many answers so I’m gonna try this again. My truck is misfiring on cylinder 8. My check engine light will flash and my Stabilitrak light will come on. It does it really bad at idle. Very rarely will to do it when I’m driving. It...
  6. Vortec 6200 6.2L V8
    I'm new to the forum and looking to get some advice and next steps on an issue I'm having. I'm running in circles. Specs: 2010 Chevrolet Silverado 1500 - 6.2l - 124k miles Issue: I'm having a misfire on cylinder #5, only at idle and when in drive. It will not misfire when in park or when...
  7. EcoTec 4.3L V6
    Ok so I have a 2015 silverado 1500 LT and cannot for the life of me figure out what is the issue. A month ago she started running rough with an obvious misfire. Check engine light had been on prior for an oil engine solenoid stuck closed or open (I believe part of the bulletin from 6-16 but will...
  8. Vortec 4300 4.3L V6
    Hi all! Hopefully there is someone out there that can help me! I have a 2006 Silverado w/t 4.3L v6. I've been trying to diagnose a random / multiple misfire code for a few weeks now and have exhausted all my options (at least all that I know). The truck will start, run, drive, then randomly lose...
  9. Vortec 5300 5.3L V8
    Whenever I start the truck cold it’ll start up to about 1k rpm then dip down below 500 and struggle to stay running unless I give it gas. Seems fine after I start driving though throwing a misfire code and 02 sensor code (p0300,p0171,p0174) MAF? 02 sensors? any help appreciated!
  10. Vortec 4800 4.8L V8
    Each day truck starts up fine. When I drive somewhere (short distance) and shut off truck, do my business, then get back and start the truck all is well. It's when I accelerate, only after the second start, that the engine starts miss firing for about a block before running normal again. Have...
  11. Vortec 4300 4.3L V6
    I went to start my truck last night and no dice. It had developed a pretty mean intermittent misfire on part and full throttle lately, but now it seems like there's no spark at all, until the second I stop cranking it, when it sometimes lets out a few burbles before coming to rest. it really...
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